Railway switches and signals – Electric automatic highway signals – mine doors – and gates – Normally open track circuit
Patent
1978-07-12
1981-02-17
Blix, Trygve M.
Railway switches and signals
Electric automatic highway signals, mine doors, and gates
Normally open track circuit
246125, 246130, B61L 102, B61L 2106
Patent
active
042510414
ABSTRACT:
At a railroad crossing, a single motion detection unit is selectively coupled to an occupied track in such manner that safe, effective and efficient control is obtained over the crossing alarm device. The means for coupling the motion detection unit includes means for terminating the activation of the crossing alarm device when a train stops on the approach track, but short of the actual intersection. Techniques for multiplexing a motion detection unit with plural tracks at the grade crossing or with multiple track circuits on a single track are provided. Safe operation is assured with multiple track occupancy irrespective of the sequence of occupancy and which is the last to remain occupied or if one of the trains stops or reverses direction of motion.
REFERENCES:
patent: 3422262 (1969-01-01), Brockman
patent: 3781542 (1973-12-01), Brockman
patent: 3781543 (1973-12-01), Staples
patent: 4120471 (1978-10-01), Auer
Blix Trygve M.
Eisenzopf Reinhard J.
General Signal Corporation
Killian George W.
Kleinman Milton E.
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